The plural -S and -ES endings might seem simple, but they have three completely different pronunciations depending on the final sound of the singular word. This is identical to the -ED rule, and understanding it will help you form plurals and verb conjugations correctly.
Why This Rule Matters
Plurals and third-person singular verbs are among the most frequently used word forms in English. If you mispronounce them, listeners immediately hear that something is not quite right. Mastering this rule makes your speech sound more native and confident.
The Three Pronunciations of -S/-ES
Just like with -ED, the pronunciation depends entirely on the final sound of the base word. The pattern is remarkably consistent.
Rule 1: /s/ After Voiceless Consonants
When a word ends in a voiceless consonant (p, t, k, f, sh), the plural -S sounds like /s/. There is no /ɪz/ or /z/.
Voiceless consonants require -S to be pronounced as /s/:
- cats /kæts/ - from "cat" /kæt/
- books /bʊks/ - from "book" /bʊk/
- cups /kʌps/ - from "cup" /kʌp/
- walks /wɔːks/ - from "walk" /wɔːk/
- laughs /læfs/ - from "laugh" /læf/
- stops /stɑːps/ - from "stop" /stɑːp/
- hopes /hoʊps/ - from "hope" /hoʊp/
- rocks /rɑːks/ - from "rock" /rɑːk/
Rule 2: /z/ After Voiced Consonants and Vowels
When a word ends in a voiced consonant (b, d, g, v, z, j, l, m, n, r) or any vowel sound, the plural -S sounds like /z/. The vowel /ɪ/ does not appear.
Voiced consonants and vowels require -S to be pronounced as /z/:
- dogs /dɔːgz/ - from "dog" /dɔːg/
- birds /bɜːdz/ - from "bird" /bɜːd/
- trees /triːz/ - from "tree" /triː/
- cars /kɑːrz/ - from "car" /kɑːr/
- names /neɪmz/ - from "name" /neɪm/
- eyes /aɪz/ - from "eye" /aɪ/
- loves /lʌvz/ - from "love" /lʌv/
- bells /bɛlz/ - from "bell" /bɛl/
Rule 3: /ɪz/ After Sibilant Sounds
Sibilant sounds are the "hissing" and "shushing" sounds: S, Z, SH, CH, X, and soft G (the /dʒ/ sound in words like "stage" or "edge"). When a word ends with any of these sounds, the plural is pronounced as /ɪz/ (an extra syllable containing the schwa /ə/ followed by /z/).
Sibilants require -ES (or -S) to be pronounced as /ɪz/:
- buses /ˈbʌsɪz/ - from "bus" /bʌs/
- roses /ˈroʊzɪz/ - from "rose" /roʊz/
- boxes /ˈbɑːksɪz/ - from "box" /bɑːks/
- churches /ˈtʃɜːtʃɪz/ - from "church" /tʃɜːtʃ/
- dishes /ˈdɪʃɪz/ - from "dish" /dɪʃ/
- judges /ˈdʒʌdʒɪz/ - from "judge" /dʒʌdʒ/
- buzzes /ˈbʌzɪz/ - from "buzz" /bʌz/
- glasses /ˈglæsɪz/ - from "glass" /glæs/
The Same Rule Applies to Third-Person Singular Verbs
Here's the important connection: third-person singular verbs (he, she, it) follow the exact same pronunciation pattern as plurals.
Examples:
- he walks /hiː wɔːks/ - /s/ after voiceless consonant
- she runs /ʃi rʌnz/ - /z/ after voiced consonant
- it washes /ɪt ˈwɑːʃɪz/ - /ɪz/ after sibilant sound
- he stops /hiː stɑːps/ - /s/ after voiceless consonant
- she loves /ʃi lʌvz/ - /z/ after voiced consonant
- he watches /hiː ˈwɑːtʃɪz/ - /ɪz/ after sibilant
Memory Tip
Think of it this way: sibilant sounds already have a "hissing" quality. When you add another -S sound, it becomes difficult to pronounce without a vowel between them. That's why English inserts /ɪ/ to separate the sounds, creating a new syllable.
The Pattern Summary
- Voiceless consonants (p, t, k, f, sh) → /s/
- Voiced consonants and vowels → /z/
- Sibilants (s, z, sh, ch, x, j) → /ɪz/ (extra syllable)
Practice Tip
When forming a plural or third-person singular verb, focus on the final sound of the singular base word or infinitive verb. Determine whether it's voiceless, voiced, or a sibilant. Once you identify the category, you automatically know which pronunciation to use. With practice, this becomes automatic and you'll sound completely natural.